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Physiological and yield responses of soybean under water deficit
Felisberto Guilherme,Schwerz Felipe,Umburanas Renan Caldas,Dourado-Neto Durval,Reichardt Klaus 한국작물학회 2023 Journal of crop science and biotechnology Vol.26 No.1
Water defcit during grain flling is a key factor on soybean (Glycine max (L.) Merrill) production, but plant response to diferent water stress levels should be better understood. This study evaluated soybean plant response to diferent soil water levels during grain flling. It was assessed the gravimetrical humidity and soil matric potential, leaf relative water content, leaf water potential, proline, and yield components of plants under a range of days without irrigation (0, 3, 6, 9, and 12) during grain flling phase. Until soil matric potential was around −0.8 atm soybean water defcit tolerance mechanisms were enough to maintain leaf relative water content and leaf water potential at acceptable levels, which proline concentration was a key factor in this mechanism. Leaf relative water content and leaf water potential showed to be related in maintaining soybean yield under water defcit and they may be used in studies of soybean tolerant cultivars to water restriction. From 9 days on, critical yield losses were observed due to water stress. The information presented in this study supports soybean producers in decision-making in irrigated systems to minimize productivity losses due to water defcit during the critical period of the crop–grain flling.
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